Baffle for paper machine



Oct. 1, 1963, D. A. GODDARD BAFFLE FOR PAPER MACHINE 2 Sheets-Sheet 1Filed April 24, 1961 \II l I I INVENTOR. DEZNlS A. GODDARD BY V 4,?

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BAFFLE FOR PAPER MACHINE Filed April 24, 1961 2 Sheets-Sheet 2ADJUSTABLE 4 3 END FIXINGS EE'PLACEABLE l9 WEAR STRIP FOAM PLASTIC,

STEEL. SKIN INVENTOR.

DEN IS A GODDARD ATTQENEY United States Patent "ice- 3,105,789 BAFFLEFOR PAPER MACHINE Denis A. Goddard, Como, Quebec, Canada, assignor toDominion Engineering Works Limited Filed Apr. 24, 1961, Ser. No. 105,1158 Claims. (Cl. 162-352) This invention relates to new and usefulimprovements in paper machinery and has particular reference to theprovision of a new and improved baffie for a Fourdrinier type papermachine.

The object of the invention is to provide a light and rigid baffiestructure for a paper machine wherein the ratio of stiffness to weightis very high.

Another object is to provide a baffle to which wear strips of varioustypes may readily be attached.

Other objects and advantages of the invention will be apparent from thefollowing description taken in connection with the accompanying claims.

Up to this time bafiies used on paper machines have been too heavy forconvenient handling or, conversely, they have been too flexible forsatisfactory functioning.

Baflles of conventional designs are subject to numerous disadvantages asfollows:

(1) Excessive cost due to the amount of welding and the employment ofexpensive structural steel.

(2) Excessive handling weight resulting in damage to the baffle and/ orsupporing members.

(3) Steel structures are deficient in internal damping and, therefore,tend to vibrate.

.(4) The mass of heavy baffles gives rise to undesirable acceleratingforces in shaking-type Fourdriniers.

It is the principal object of this invention to provide a new andimproved baffie which overcomes the disadvantages set forth above andwhich is relatively light weight yet rigid and which is relativelysimple and economical to manufacture.

Referring to the drawings:

FIG. 1 is a schematic side view of a Fourdrinier paper machine embodyingthe invention;

FIG. 2 is a fragmentary sectional view taken on line 2-2 of FIG. 1,looking in the direction of the arrows; and

FIG. 3 is a fragmentary sectional view taken on line 3-3 of FIG. 2,looking in the direction of the arrows.

Referring more particularly to the drawings wherein similar referencecharacters designate corresponding parts throughout, the Fourdrinierpaper machine shown embodying the invention includes the side beams 14only one of which is shown and on which are mounted the table rolls 11,over which the Fourdrinier wire 12 runs, all in conventional manner.

On the side beams are provided the supports 13 having the adjustable endfixings 14 for supporting the trunnions 15 which are secured by weldingor the like to each end of the bafiie indicated generally at 16 andwhich consists of a relatively light skin or casing 17 of steel or othersuitable material. The baffle is provided with the reinforcement orstrut 18 which provides rigidity and reinforcement to thereby assist ingetting the loads in the skin 17 concentrated in the trunnions.

The baffle 16 is provided with the replaceable Wear strip 19 which isdesigned in accordance with the specific function of the baffle and maytake any of various forms and may readily be changed. Adjustable endfixings 14 are provided having vertical, horizontal, and angular rangesof adjustment.

The baffle 16 is stabilized by being filled with foam plastic, the typeof foam plastic employed is preferably polyurethane or other suitablematerial having the property of expanding when it polymerizes. Theplastic is 3,165,789 Patented Oct. 1, 1963 introduced into the interiorof the bafiie after welding and provides the internal pressure forpre-stressing the steel skin 17. This pre-stressing of the skin 17 andcontact with the solidified foam, stabilizes the configuration of thebaflle, so as to develop the full potential strength of the skin byprevention of local buckling.

I .Fluid under pressure could be employed to pre-stress the skin of thebaffle but would not stabilize the skin against local buckling which thelight solidified foam accomplishes effectively. I

In addition to lightness and rigidity other advantages of battles madein accordance with this invention are ease of handling and ease ofadjustment and other advantages 'derive from the characteristicallyclean form of this construction and elimination of intolerablevibration.

In brief, the bathe comprises a light sheet steel casing which is filledwith a foam plastic which has the effect of pro-stressing andstabilizing the sheet steel skin, providing a rigid structure with avery high stiffness to weight ratio.

Also, by fitting an appropriate type of wear strip, table roll bafflesmay retard the rate of drainage through the Fourdrinier wire, increasethe rate of drainage through the Fourdrinier wire and prevent throwbackof white water onto the underside of the Fourdrinier wire, or againstadjacent table rolls.

From the foregoing it will be seen that I have provided new and improvedmeans for obtaining all of the objects and advantages of the invention.

I claim:

1. A baffie for a Fourdrinier machine including, a relatively lightweight skin, end plates and a trunnion secured to each end of said endplates for supporting said bafiie in operative position on the machine,reinforcement means within said skin for providing stability wherebyexternal loads applied to said skin are transmitted to said trunnlions,said baffie being filled with a solidified plastic material forstabilizing said skin and preventing buckling thereof, said bafflehaving a longitudinal recess in its upper edge for receiving a wearstrip.

2. A bafiie for a Fourdrinier machine including, a relatively lightweight skin, end plates and a trunnion secured to each end of said endplates for supporting said baffle in operative position on the machine,reinforcement means within said skin for providing stability wherebyexternal loads applied to said skin are transmitted to said trunnions,said baffle being filled with a solidified plastic material forpre-stressing said skin and preventing buckling thereof, said bafilehaving a longitudinal recess in its upper edge for receiving a wearstrip.

3. A bafiie for a Fourdrinier machine including, a relatively lightweight skin, end plates and a trunnion secured to each end of said endplates for supporting said baffle in operative position on the machine,reinforcement means Within said skin for providing stability wherebyexternal loads applied to said skin are transmitted to said trunnions,said baffie being filled with a solidified plastic material forstabilizing said skin and preventing buckling thereof and adjustable endfixings for supporting said trunnions, said baffle having a longitudinalrecess in its upper edge for receiving a wear strip.

4. A baffie for a Fourdrinier machine including, a rela- 5. A bathe fora Fourdrinier machine including, a relatively light weight skin, endplates and a trunnion secured to each end of said end plates forsupporting said baflle in operative position on the machine,reinforcement means within said skin for providing stability wherebyexternal loads applied to said skin are transmitted to said trunnions,said baflle being filled with a solidified plastic material forpre-stressing said skin and preventing buckling thereof, said bafilehaving a longitudinal recess in its upper edge and a replaceable Wearstrip in said recess.

6. A baflle for a Fourdrinier machine including, a relatively lightWeight skin, end plates and a trunnion secured to each end of said endplates for supporting said bafile in operative position on the machine,reinforcement means within said skin and connected to the oppositesurfaces thereof for providing stability whereby eX- ternal loadsapplied to said skin are transmitted to said trunnions, said bafllebeing filled with a solidified plastic material for stabilizing saidskin and preventing buckling thereof, said bafile having a longitudinalrecess in its upper edge for receiving a Wear strip.

' 7. A bafii for a Fourdrinier machine including, a relatively lightweight skin, end plates and a trunnion secured to each end of said endplates for supporting said bafiie in operative position on the machine,reinforcement means Within said skin for providing stability wherebyexternal loads applied to said skin are transmitted to said trunnions,said bafile being filled with a solidified plastic material forpre-stressing said skin and preventing buckling thereof, said bafiiehaving a longitudinal recess in its upper edge and a replaceable wearstrip in said recess applied to said skin are transmitted to saidtrunnions on the machine, said baflie being filled with a solidifiedplastic material for stabilizing said skin and preventing buck- 7 lingthereof, said bafile having a longitudinal recess in its upper edge forreceiving a wear strip.

References Cited in the file of this patent UNITED STATES PATENTS541,336 Savery Iune18, 1895 1,781,928 Liebeck Nov. 18, 1930 2,409,910StOber Cd. 22, 1946 2,629,698 Sterling Feb. 24, 1953 2,718,824Hornbostel Sept. 27, 1955 2,744,454 -Wage!ik1iecht May 8, 1956 2,767,461Leb'oldeb al. Oct. 23, 1956 2,855,021 Hoppe Oct. 7, 1958 2,858,746"Goodvvillie' NOV. 4, 1958 2,393,486 Mani July 7, 2,900,023 Hornbo'stel-Aug. ,18, 1959 2,928,465 Wrist Mar. 15, 1960 FOREIGN PATENTS I 561,716

Great Britain June 1, 1944

1. A BAFFLE FOR A FOURDRINIER MACHINE INCLUDING, A RELATIVELY LIGHTWEIGHT SKIN, END PLATES AND A TRUNNION SECURED TO EACH END OF SAID ENDPALTES FOR SUPPORTING SAID BAFFLE IN OPERATIVE POSITION ON THE MACHINE,REINFORCEMENT MEANS WITHIN SAID SKIN FOR PROVIDING STABILITY WHEREBYEXTERNAL LOADS APPLIED TO SAID SKIN ARE TRANSMITTED TO SAID TRUNNIONS,SAID BAFFLE BEING FILLED WITHA SOLIDIFIED PLASTIC MATERIAL FORSTABILIZING SAID SKIN AND PREVENTING BUCKLING THEREOF, SAID BAFFLEHAVING A LONGITUDINAL RECESS IN ITS UPPER EDGE FOR RECEIVING A WEARSTRIP.